Sewing



(No Model.) 2 Sheets-Sheet 1.

L MUTHER SEWING MACHINE.

"No. 844,493. Patented June 29, 1886.

(No Model.) 2 Sheets-Sheet 2. L. MUTHER.

SEWING MACHINE.

Patents 11110 29, 1886.

NITED STATES PATENT OFFICE.

LORENZ MUTHER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE UNION BAG MACHINECOMPANY, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 344,493, dated June 29,1886.

Application filed August 31, 1885. Serial No. 175,740. (No model.)

To all whom it may concern.-

Be it known that I, LORENZ MUTHER, of Chicago, county of Cook, and Stateof Illinois, have invented an Improvement in Sewing- Machines, of whichthe following description, in connection with the accompanying drawings,is a specification, like letters on the drawings representing likeparts.

The invention herein to be described is an IO improvement on thatdescribed in United States Patent No. 299,568, dated June 3, 1884,

and has for its object to enable the rapid production of a seam orstitching composed of three threadstwo upper or needle threads and oneunder or looper thread, the latterbe ing enchained with the loops ofupper thread, as fully described in application, Serial No. 175,737,filed concurrently herewith.

The machine describedin the patentreferred to contains but one upperthread-carrying needle, but herein the needle-bar is provided with twoupper-thread-carrying needles, each adapted to penetrate the material,one of the needles-viz., that one nearest the upright arm of themachinebeing set the highest, to place the eyes of said needles inposition to accommodate the circular movement of the looper. The looperis provided with a shoulder to act upon and deflect the loops of nee- 0dle-thread as the looper is retracted or moved backward,and just as theneedles are passing through the material to enter the loop oflooper-thread, the said shoulder holding the said loop, so that theneedles will pass each 5 at the left-hand side of the loop of its ownthread then held by the looper, the operator sitting at the front of themachine, and the feed being directly away from her.

To prevent the material entered by the two lines of loops ofupper-thread from being puckered or distorted when en ch aining thelooper or third thread with the two loops of upper thread below thematerial, Ihave provided the'needlethroat plate with a tongue whichoccupies a space equal to the distance between the two upper needles,andwhich is of sufficient length to remain in place between the lines ofstitches until the stitch is finished, the loops of under 1 threadthereafter passing off the under side of the tongue as the feed takesplace.

My invention consists, essentially, in the combination, in asewing-machine, of the following instrumentaiities, viz: a needle-bar,two eye-pointed needles held therein, and a looper or under threadcarrier having a movement at right angles to the feed, and also in theline of movement of the feed, and with means to move the needle-bar andthe looper, whereby the two needles are made to descend through the loopof looper-thread, and thereafter,while the two needles are yet below thematerial, the looper is made to enter the two loops of upper or needlethread to operate substantially as will be described; also, in asewingmachine, a throatplate having two needle-holes and a tonguebetween them and two eye-pointed upper-thread-carrying needles, combinedwith an oscillating looper and a rocking frame upon which the looper hasits fulcrum to operate all substantially as will be described; also, ina sewing-machine, a throat-plate having two needle-holes and a tonguebetween them and two eye-pointed upper-thread-carrying needles, combinedwith an oscillating looper having a shoulder and a rocking frame,uponwhich the looper has its fulcrum, to operate all substantially as willbe described.

Figure l in perspective represents a sewing-machine embodying my presentimprovements, the presser-foot and part of the spoolcarrying bracketbeing omitted; Fig. 2, an elevation thereof with the cloth-plate andneedle-throat omitted, the presser-foot being lifted. Fig. 3 is a detailchiefly to show the needles and the looper. Fig. 4 shows thethroat-plate detached. Fig.5 shows theloop er in elevation. Fig. 6 showsthe looper in top or plan view; Fig. 7, a detail showing the looper asholding the two loops ofneedlec thread; and Fig. 8, an under side viewof the material, showing the formation of the stitch.

The frame-work, the needle-bar B, the main shaft C, the pitman A, tovibrate the looper, the looper-pivot m, the rocking frame or sup- 5 portA having its pivots in a line parallel with the main shaft, the arm A toco-operate with a cam 011 the said main shaft and rock the frame orsupport A the feedingbar D, the presser-bar, and the cloth or work supporting plate are all substantially as in the said Patent No. 299,568,so need not beherein minutely described.

Herein the looper (marked A and shown enlarged in Figs. 5 and 6, as inthe said patent,) has two eyes, 2 3 ,to receive the third or under orlooper thread from the spool 2. The looper is attached toalooper-shank,5,mounted on the pivot m,and provided with a pin'or stud,6, which is embraced by the split head 7 at the end of the rod A. Thepivot m of the looper A is held on the rocking frame A which is pivotedat its ends, the pivot m of the looper being at right angles to thepivot of the rocking frame A whereby the looper, besides its movement toenter the loops of needle-thread, is also capable of having a move mentlaterally or in the direction of the feeding movement of the feedingdevice.

As so far described,the looper is common to the said patent; but hereinthe looper has a shoulderat 8, which in the backward movement of thelooper in the direction of the arrow, Fig. 5, acts to deflect theloopsof needlethread then held on the looper, holding them in such positionthat the needles, which are at that time descending through the materialand below the throat-plate, will descend each at the left hand orfarthest side of the loop ofits own thread then held by the looper, asin Fig. 7. The needle-bar c has at its lower endjtwo eye-pointedneedles, a b, the eye of the former being set the lowest, the eyes ofthe needles being so set (see Fig. 2) as to stand in the arc in whichthe looper A moves, so that the said looper may enter one and then theother loop of needle-thread thrown out from the two needles ab. The twoneedles ab having descended at the left of the loop of their ownthreads, as

described, and entered between the looper and the loop of its thread,the looper is retracted or drawn back until its point passes to theright of the needle 6, when the rocking support A is operated to movethe looper bodily in the direction of the movement of the material bythe feeding-bar until the point of the looper has been carried farenough backward in the direction of the feed movement of the cloth toenable the looper to pass the needles at their sides farthest from theoperator in the direction of the feed, and then the needles having beenlifted far enough to throw out their threads to form loops the looper isthrown quickly forward and made to enter the loops of thread thrown outfrom both needle s,and the needles are raised from the material and thefeed takes place, and the frame A is moved toward the front of themachine, again placing the looper in such position that the two needlesa b in their next descent will again enter between the looper and itsthread as before, the result of such operation being the production of aseam or double line of stitching composed of two needle-threads unitedby a loop of under thread or a third thread carried by thelooper, or astitch or seam, as described in my application, Serial No. 175,737,filed August 31, 1885.

In the formation-of the seam or stitches by the mechanism described,theneedle a descends through the needle-hole 12 in the combinedneedle-throat and feed-plate T, at one side of the tongue it, while theneedle I; descends through the needle-hole 13 at the opposite side ofthe tongue, the latter supporting the under side of the cloth or othermaterial in which the stitches are taken, between the two lines wherethe said needles penetrate the said material, the said tongue continuingto support the said material while the loop of looper-thread is beingpulled, and the stitch is being set or drawn taut, the tongue acting toprevent the material from being puckered, or drawn, or bunched betweenthe lines of stitches. The tongue makes it possible to leave the loopsof third or looper thread at the under side of the material to lie flatthereon and of substantially equal lengths, thus presenting a uniformwidth of scam. After the stitches have been finished or drawn taut intothe material the movement of the latter by the feed-bar causes part ofthestitching, which includes the looper-thread, the latter, as thestitch is drawn taut crossing the under side of the tongue, to pass fromthe end of the tongue.

I am aware that the loops of thread of two needles have been entered bya shuttle.

I claim 1. In a sewing-machine, a reciprocating needle-bar, twoeye-pointed needles, a b, having their eyes located at differentdistances from the end of the needle-bar and connected therewith, andadapted to receive two independent threads, combined with athread-carrying looper having a pivot at m, and the rocking frame tohold the said pivot, and with means, substantially as described, tovibrate the said looper and cause it to enter both loops ofneedle-thread, and also to move the looper to place it in position tohave the loop of its thread entered by both needles, and then by changeof position of the looper to enter both loops of needle-thread,substantially as described.

,2. The reciprocating needle-bar and two eye-pointed thread-carryingneedles having their eyes located at different distances from the end ofthe needle-bar, combined with a rocking arm and a looper pivotedthereon, and having a shoulder, 8, to pull aside the loops ofneedle-thread held thereon as the needles are descending through thematerial, in order that the said needles may pass at one side of theloops of their own thread as they thread-carrying needles attached toit, and I In testimony whereoflha'vesigned my name IO the looper, andmeans, substantially as deto this specification in the presence of twosubscribed, to operate it, combined with the scribing witnesses.

throat-plate provided with the two needleholes and the intermediatetongue to support LORENZ MUTHER.

the material and prevent it from being puckered or gathered between thelines of stitching \Vitnesses:

composed of the three threads, substantially \V. S. NORTH,

as described. E. P. HATCH.

